Texas Instruments TLV73318PDQNR3

Overview

TLV73318PDQNR3 from Texas Instruments is a capacitor-free, 300-mA, low-dropout linear regulator (LDO) delivering a fixed 1.8 V output with 125 mV dropout at 300 mA, 1% typical output accuracy, and 34 µA quiescent current. It operates across 1.4 V to 5.5 V input range and features active output discharge, foldback overcurrent protection, and thermal shutdown - ideal for space-constrained, battery-powered applications such as camera modules and smartphone subsystems.

For engineers reviewing the TLV73318PDQNR3 datasheet, TLV73318PDQNR3 pinout, TLV73318PDQNR3 application, or TLV73318PDQNR3 equivalent, key selection criteria include its X2SON-4 package footprint, capacitor-free stability, ultra-low IQ, precise 1.8 V regulation under load transients, and enable-controlled power sequencing in portable electronics.

Technical Context

The TLV73318PDQNR3 uses a PMOS pass transistor architecture enabling true capacitor-free operation - stable without input or output capacitors while supporting optional 1-µF ceramic output capacitance. Its internal UVLO circuit (1.3 V rising threshold) prevents erratic startup below valid input voltage, and the active pull-down circuit (120 Ω) ensures rapid output discharge during disable.

Functional modes include normal regulation, dropout operation (where VOUT = VIN – VDO), and disabled state triggered by EN < 0.35 V or VIN < 1.25 V. Foldback current limiting reduces output current as VOUT collapses - limiting short-circuit current to ~170 mA at 3.3 V and ~150 mA at 1.0 V - while thermal shutdown (160°C trip, 140°C reset) provides secondary fault protection.

Key Specifications

Pinout & Package

The TLV73318PDQNR3 is housed in a 1.0 mm × 1.0 mm, 4-pin X2SON (DQN) package with an exposed thermal pad electrically connected to GND. The compact footprint supports high-density PCB layouts and enables efficient heat dissipation when the thermal pad is soldered to a GND plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TLC73318PDQNR and MCP1700T-1802E/TT, TLV73318PDQNR3 uniquely combines capacitor-free stability, 125 mV dropout, and 34 µA IQ in a 1-mm² package - making it the only option that meets all three requirements simultaneously for modern portable electronics.

Availability

TLV73318PDQNR3 is available at Aetrix Electronics and suitable for camera modules, smartphone subsystems, wearable health sensors, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TLV73318PDQNR3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs for portable, industrial, and automotive markets.

The TLV733 series was designed specifically for space- and power-constrained portable electronics, emphasizing capacitor-free operation, ultra-low IQ, and robust protection features for battery-powered applications.

FAQ

What is the dropout voltage of TLV73318PDQNR3 at full load?

The TLV73318PDQNR3 has a dropout voltage of 125 mV at 300 mA output current and 1.8 V nominal output, measured at –40°C to +85°C. At full temperature range (–40°C to +125°C), maximum dropout is 270 mV. This allows reliable operation from as low as 1.925 V input at room temperature, critical for single-cell lithium-based power sources feeding the TLV73318PDQNR3.

Does TLV73318PDQNR3 require input or output capacitors?

No, TLV73318PDQNR3 is explicitly designed for capacitor-free operation - stable with zero input or output capacitance. However, a 1-µF ceramic capacitor on OUT is optional and improves load transient response. No minimum CIN is required, eliminating BOM cost and board area while avoiding inrush current issues at startup - a key differentiator of the TLV73318PDQNR3 versus conventional LDOs.

How does the enable pin (EN) function on TLV73318PDQNR3?

The EN pin of TLV73318PDQNR3 is active-high with VEN(HI) ≥ 0.9 V (min) to enable regulation and VEN(LO) ≤ 0.35 V (max) to disable. There is no internal pullup or pulldown resistor, so external logic must drive EN fully. When disabled, TLV73318PDQNR3 engages an internal 120 Ω pulldown on OUT to discharge the output node - ensuring rapid rail collapse and preventing unintended operation of downstream circuitry.

What protection features does TLV73318PDQNR3 include?

TLV73318PDQNR3 integrates foldback overcurrent protection, thermal shutdown (160°C trip, 140°C reset), undervoltage lockout (UVLO with 1.3 V rising threshold), and active output discharge. During overload, foldback reduces output current as VOUT falls - limiting power dissipation. Thermal shutdown disables the output until junction temperature cools, and UVLO prevents erratic behavior during brownout. These protections operate autonomously without external components.

Is TLV73318PDQNR3 suitable for automotive applications?

TLV73318PDQNR3 is specified for –40°C to +125°C junction temperature and qualified to JEDEC standards, but it is not AEC-Q100 qualified and lacks automotive-specific documentation (e.g., PPAP, failure-in-time data). It may be used in non-safety-critical infotainment or accessory modules where industrial-grade reliability suffices, but TLV73318PDQNR3 is not recommended for ADAS, powertrain, or safety-critical automotive systems without additional qualification.